life quality changes

- refactored SurveyController.cs
- added ProducesResponseType to every endpoint in every controller
- remade mappers

SurveyBackend/SurveyBackend.API/Mappers/SurveyMapper.cs

@@ -0,0 +1,28 @@
+using SurveyBackend.DTOs.Survey;
+using SurveyLib.Core.Models;
+
+namespace SurveyBackend.Mappers;
+
+public static class SurveyMapper
+{
+    public static Survey CreateDtoToModel(CreateSurveyDto dto, int userId)
+    {
+        return new Survey
+        {
+            Title = dto.Title,
+            Description = dto.Description,
+            CreatedBy = userId
+        };
+    }
+
+    public static OutputSurveyDto ModelToOutputDto(Survey survey)
+    {
+        return new OutputSurveyDto
+        {
+            Id = survey.Id,
+            Title = survey.Title,
+            Description = survey.Description,
+            CreatedBy = survey.CreatedBy,
+        };
+    }
+}